#include<stdio.h>
int main(){
	int a,b,c;
	int p;
	scanf("%d %d %d",&a,&b,&c);
	if(a<b){
	p=a;
	a=b;
	b=p;
	}
	if(b<c){
	p=b;
	b=c;
	c=p;
	}
	if(a<b){
	p=a;
	a=b;
	b=p;}
	if(b+c<=a){
	printf("Not triangle\n");
	}else{
	if(b*b+c*c==a*a){
	printf("Right triangle\n");
	}
	if(b*b+c*c>a*a){
	printf("Acute triangle\n");}
	if(b*b+c*c<a*a){
	printf("Obtuse triangle\n");
	}
	if(a==b||b==c||a==c){
	printf("Isosceles triangle\n");
	}
	if(a==b&&a==c&&b==c){
	printf("Equilateral triangle\n");
	}}
	return 0;
}
